Date: Wed, 05 Feb 2003 13:38:50 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: Anoop Ranganath <anoop@ranganath.com> Cc: freebsd-current@freebsd.org Subject: Re: tmpfile breakage on setuid executables Message-ID: <3E41846A.39AAE406@mindspring.com> References: <00e201c2cd5b$14f31c30$0c02040a@ranganath>
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Anoop Ranganath wrote: > The problem reared it's ugly head when maildrop started mishandling > mesasges. Here is what I've tracked it down to: > > I've used the code at the bottom of this message to isolate this > bug. The summary is that when I compile the code as root, and then > make it setuid (chmod u+s a.out) and then try to run it as a user, the > tmpfile() fails. If I run it as root, it works fine. Conversely, I > can give user ownership of the executable, and then run it as user, and > it works great, but if fails for root. Again this is only with the > setuid bit set. Probably your real and effective UID's aren't the same. Does your SUID root program set the real UID from the effective UID? -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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